IBM SC34-7012-01 manual regions that do have persistent sessions support

You can then start further CICS regions with or without persistent sessions support

as appropriate, provided that you do not exceed the limit for the number of

regions that do have persistent sessions support.

If you specify NOPS (no persistent session support) for the PSTYPE system

initialization parameter, a zero value is required for the PSDINT (persistent session

delay interval) system initialization parameter.

When persistent sessions support is not in use, all sessions existing on a CICS

system are lost if that CICS system, VTAM, or z/OS fails. In any subsequent restart

of CICS, the rebinding of sessions that existed before the failure depends on the

AUTOCONNECT option for the terminal. If AUTOCONNECT is specified for a

terminal, the user of that terminal waits until the GMTRAN transaction has run

before being able to continue working. The user sees the VTAM logon panel

followed by the “good morning” message. If AUTOCONNECT is not specified for

a terminal, the user of that terminal has no way of knowing (unless told by

support staff) when CICS is operational again unless the user tries to log on. In

either case, users are disconnected from CICS and need to reestablish a session, or

sessions, to regain their working environment.

Chapter 3. Shutdown and restart recovery 41